Lemuria

Lemuria was hypothesized as a land bridge, now sunken, which would account for certain discontinuities in biogeography. This idea has been rendered obsolete by modern theories of plate tectonics. Sunken continents such as Zealandia in the Pacific, and Mauritia[2][original research?] and the Kerguelen Plateau in the Indian Ocean do exist, but no geological formation under the Indian or Pacific Oceans is known that could have served as a land bridge between continents.[3][original research?]